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- W2189497334 abstract "Metamorphosed hydrothermal gold and massive sulfide deposits are now widely recognized in multiply-reworked Precambrian terranes around the world. In most cases the absolute timing of pre-metamorphic mineralization can only be inferred and is based largely on the absence of telltale hydrous alteration assemblages and the occurrence of unusual retrograde native metal and sulfide assemblages and textures diagnostic of sulfide partial melting. In this contribution, I demonstrate that a significant portion of the prograde and peak temperature-time (T-t) history at the metamorphosed (granulite-facies) Griffin’s Find deposit, Western Australia, is preserved by: 1) inclusion suites in poikiloblastic garnet cores; 2) core-to-rim Y, Cr, Sc, P and REE zoning in garnet; 3) the ages of sub-solidus monazite inclusion in garnet, and; 4) the ages of neoformed monazite and zircon that crystallized in leucosomes. The result of integrating these datasets demonstrates that host rocks to the Griffin’s Find deposit encountered lower amphibolite facies conditions (540oC) at 2645 ± 5 Ma and passed into the melt-stability field above 3.5 kbar based on the discontinuous nature of Cr zoning in garnet. The rocks subsequently reached peak P-T conditions of 850oC and 6.5 kbar at or before 2625 ± 5 Ma based on the timing of monazite and zircon crystallization in leucosomes. If this 20 Ma record of prograde metamorphism is considered as a single ‘event’, then the calculated heating rate is ~15oC/Ma, roughly an order of magnitude higher than estimates for collisional orogenic belts (e.g., Foster et al., 2004). These compressed timescales and high heating rates are diagnostic of contact metamorphism rather than collisional orogenesis. Basic magmatic activity across the Lake Grace Terrain, including charnockitic plutons south of Griffin’s Find, have zircon crystallization ages as old as 2652 Ma, hinting at a possible mechanism to produce both hydrothermal (intrusion-related?) gold mineralization followed shortly by inversion of pre-heated crust to produce low-P granulites." @default.
- W2189497334 created "2016-06-24" @default.
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- W2189497334 date "2010-01-01" @default.
- W2189497334 modified "2023-09-27" @default.
- W2189497334 title "Geodynamic constraints on mineralization and metamorphism at the Griffin's Find gold deposit, Western Australia, from calibrated T-t trajectories" @default.
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